This Lyman manufactured single cavity bullet mould appears to have been modified. It is hand scratched with serial #424103 and stamped .44-40 O'Neil .427 diameter. Top was drilled too close to the top and has a fine crack which does not affect the mould. Otherwise the bullet mould is in good condition with some light specks of surface rust.
Note: this mould should be used with the single cavity (small) handle. (file photo)